Coal, graphite and diamond are different froms of _________.

Options

A. Iron
B. Carbon
C. Copper
D. Aluminium

Answer

**Step-by-Step Solution:**

1. **Identify the substances**: The question lists coal, graphite, and diamond. We need to determine what they are different forms of.

2. **Classify the substances**: All three substances—coal, graphite, and diamond—are forms of carbon. They are classified as non-metals.

3. **Understand allotropy**: Graphite and diamond are known as allotropes of carbon. Allotropes are different physical forms of the same element.

4. **Examine coal**: Coal is also a form of carbon, but it is an amorphous form, meaning it does not have a definite crystalline structure like graphite and diamond.

5. **Conclusion**: Since coal, graphite, and diamond are all forms of carbon, the answer to the question is carbon.

**Final Answer**: Coal, graphite, and diamond are different forms of **carbon**.

---